What were you trying to do that didn't work?

We are trying to set up an automated rsync over SSH but want to limit the target access

rsync provides a script in /usr/share/doc/rsync/support/rrsync , however this outdated perl script is not very secure

There is a more recent alternative based on python3 at https://github.com/WayneD/rsync/blob/master/support/rrsync which prevent users to abuse symlinks to go outside allowed directories

Please update the script in the rsync package.